The first treadmill was invented by Thomas Edison so he could stay indoors while taking his pet light bulb for walks. Enjoy the fruits of lazy geniuses with today's Groupon: for $20, you get a one-month Basic Plus membership to Bailey's Powerhouse Gym (a $30 value) with a personal-training session (a $21 value) and unlimited group fitness classes (a $19 value; a $70 total value). This Groupon is valid at 10 locations in Orange Park, Atlantic Beach, Jacksonville, and Jacksonville Beach.

Bailey's Powerhouse Gym Basic Plus members can sweat solo on modern, well-maintained exercise equipment accessible 24 hours a day, or join others for a one-on-one training and group fitness classes. A one-hour personal-training session with one of Bailey's trained fitness gurus can bolster motivation, help design a workout routine, or refresh your memory about hard-to-remember state capitals. Then, pump muscle with exercise accessories available 24 hours a day at every Bailey's gym, including a smorgasbord of cardiovascular equipment, a plethora of strength-training machines and free weights, and a boatload of synonyms for the word many. Other amenities vary from gym to gym, but may include boxing rooms, saunas, or cardio theater rooms stuffed with big-screen TVs and surround-sound speakers designed to distract exercisers from their toil or the fact that their hair is on fire.

Gym members can also sweat away excess calories in unlimited group fitness classes such as boot camp (Atlantic Beach, Jacksonville Beach, or Baymeadows and Mandarin in Jacksonville only), kickboxing (Orange Park or Parental Home Road and Westside in Jacksonville only), Zumba (available at all locations), and competitive crochet. See the class schedule for full details.